PDF malware analysis — malicious · 5e9f08b9894e1351

MALICIOUS

PDF

76.9 KB Created: 2021-09-04 07:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 0cbe3751fc1b1b03c8d56ef581165254 SHA-1: f242c0bd517c1ef24420be36a9df55db48827da5 SHA-256: 5e9f08b9894e1351c1f305bff0e33fe0b7e93e3af59ed43f4ab9931efb08b0cb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing or spam campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9901

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://archism.ru/uplcv?utm_term=opinion+essay+ielts+sample+pdf PDF link annotation
- http://basyapiemlak.com/yukleme_klasoru/userfiles/file/2333126980.pdfIn PDF document text
- https://moderator.lt/components/com_mijoshop/opencart/image/data/files/17877157825.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a66da71bf31---mifinizezumadesogaw.pdfIn PDF document text
- http://55pluscommunityspecialist.com/userfiles/files/jinitizabedojaja.pdfIn PDF document text
- http://arablift.net/userfiles/file/nijos.pdfIn PDF document text
- http://altelaw.com/uploads/image/file/neseko.pdfIn PDF document text
- https://webmenuplus.com/images/file/41625227868.pdfIn PDF document text
- http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608000873d273---87183083008.pdfIn PDF document text
- http://studionegrelli.it/userfiles/files/vulifadagevir.pdfIn PDF document text
- http://zonazero.es/userfiles/file/kemuzutipubixazumuduxo.pdfIn PDF document text
- https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/42bb1116cf8f511b64dbff65dd2a75e5/60601720613.pdfIn PDF document text
- https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/auribiv5d8adqge2sa9jkc8qrr/10028775452.pdfIn PDF document text
- http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/nutafowulejevamiwetupamip.pdfIn PDF document text
- https://hiroyoung.com/data/files/xabakuduzovigeje.pdfIn PDF document text
- https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/4a6acc60eb82798e0b42945e7db32294/simotidexuxero.pdfIn PDF document text
- http://rustproofingottawa.com/userfiles/file/jatawiwedotu.pdfIn PDF document text
- http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3477bdb1ae17d2656fc9a5d0bcd5f928/metilorefezeguripagezavel.pdfIn PDF document text
- http://tipsclubcr.com/campannas/file/falipalozixulejetat.pdfIn PDF document text
- http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/vk31v78p1embgh5edvr4baoeh6/ruvogofuwevi.pdfIn PDF document text
- http://cp-1.ru/userfiles/files/45032389017.pdfIn PDF document text
- https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/5m2uh3o6u71iio7f72rrnum2gg/xinobebe.pdfIn PDF document text
- http://yasaitogo.com/uploads/files/xinodujinavikujedobaf.pdfIn PDF document text
- https://alakharia.com/public_html/userfiles/file/98233840440.pdfIn PDF document text
- https://tidaksusah.com/contents//files/3152358678.pdfIn PDF document text
- https://barcelona-health.com/files/galeria/files/lerinewinutuvosodilal.pdfIn PDF document text
- https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3424018b0---butugaxom.pdfIn PDF document text
- http://eluvial.com/sites/all/sites/eluvial.com/files/66651129106.pdfIn PDF document text
- https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/088e93f1b0108ee57b72f2c49e740ee4/58546830121.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000cb88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB88	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e39f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE39F	10700 bytes
SHA-256: `57eb6da654350b3569c23b23de905b0d9690a0ffd155cf2258a1748d6959caf2`
`font_02_sfnt_off0000fc32.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC32	16224 bytes
SHA-256: `1439bbc3a162f5b037ff9e65e2f294cf61b63577e6d9203c1212a8600f6e7093`

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